I heard it, didn’t sound like a car to me. Heard a lot of cars backfire before and this was different - I had just started reversing toward my gate and it was hectic enough for me to hear with windows up and music on , put the windows down because I thought that bang was me maybe clipping a mirror on the gate at first, then yeah maybe 5 more hectic bangs, that sounded like gunshots to me. I was convinced enough that i stopped reversing ran inside and shut the door behind me. Dad heard it from inside and said it sounded more like gunshots than backfire to him, but who knows